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Cactus Jack pegmatite, Burnet County, Texas, USAi
Regional Level Types
Cactus Jack pegmatitePegmatite
Burnet CountyCounty
TexasState
USACountry

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PhotosMapsSearch
01617820014947028107323.jpg
Muscovite

Cactus Jack pegmatite, Burnet County, Texas, USA
06558570014958869556532.jpg
Monazite-(Ce), etc.

Cactus Jack pegmatite, Burnet County, Texas, USA
09298190014950820084014.jpg
Monazite-(Ce), etc.

Cactus Jack pegmatite, Burnet County, Texas, USA
04600620014959033707542.jpg
Muscovite

Cactus Jack pegmatite, Burnet County, Texas, USA
01643880014948543463845.jpg
Monazite-(Ce), etc.

Cactus Jack pegmatite, Burnet County, Texas, USA
03134570014948543462322.jpg
Monazite-(Ce), etc.

Cactus Jack pegmatite, Burnet County, Texas, USA
01617820014947028107323.jpg
Muscovite

Cactus Jack pegmatite, Burnet County, Texas, USA
06558570014958869556532.jpg
Monazite-(Ce), etc.

Cactus Jack pegmatite, Burnet County, Texas, USA
Latitude & Longitude (WGS84):
30° North , 98° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~41km
GRN:
N21W60
Type:
Pegmatite
KΓΆppen climate type:
Cfa : Humid subtropical climate
Mindat Locality ID:
132154
Long-form identifier:
mindat:1:2:132154:1
GUID (UUID V4):
623fec7c-4c37-46e5-b8d2-6a399ec79735


Named by Franklin Roberts, co-developer of this location, in honor of "Cactus" Jack Carson, also a co-developer. Jack was the owner-operator of Cactus Canyon Quarries, Inc and was something of a local Texas legend since the 1950's. He and his son Andy Carson were instrumental in helping Mr. Roberts with the initial excavation of the new pegmatite. Without their heavy equipment and experience, H'd still be out in a sweltering Texas cow pasture trying to dig a hole in solid rock with nothing but a pick and shovel. Cactus Jack passed away within a year of excavating the pegmatite.

5 miles east of Lake Buchanan.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


22 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

β“˜ Albite
Formula: Na(AlSi3O8)
βœͺ Beryl
Formula: Be3Al2(Si6O18)
Habit: Hexagonal
Colour: green, blue-green
Fluorescence: none
Description: Tapered hexagonal crystal segments up to 12 cm between opposite faces. Some specimens found growing from milky quartz matrix. Deeper material may be of gem guality.
βœͺ Beryl var. Aquamarine
Formula: Be3Al2Si6O18
Habit: Hexagonal
Colour: green, blue-green
Fluorescence: none
Description: Tapered hexagonal crystal segments up to 12 cm between opposite faces. Some specimens found growing from milky quartz matrix. Deeper material may be of gem guality.
β“˜ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Habit: Hexagonal books to 2 cm in thickness, 10 cm in girth.
Colour: Black, Golden (when weathered)
Fluorescence: None
Description: Occurs in the graphic granite zone of the pegmatite. Tiny cyrtolite zircons sometimes found between biotite laminae.
β“˜ Euxenite-(Y)
Formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
β“˜ Fluorite
Formula: CaF2
References:
Franklin Roberts
β“˜ Fluorite var. Chlorophane
Formula: CaF2
References:
Franklin Roberts
β“˜ Galena
Formula: PbS
Habit: Massive, fracture-filling
Colour: Dark gray
Fluorescence: None
Description: Occurs as radiogenic galena in the interstitial spaces of radioactive rare-earth minerals from orange clay-filled crystal pockets in the pegmatite.
β“˜ Ilmenite
Formula: Fe2+TiO3
β“˜ 'Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series'
Formula: (Ta,Nb,Sn,Fe,Mn)4O8
β“˜ Microcline
Formula: K(AlSi3O8)
β“˜ 'Microlite Group'
Formula: A2-mTa2X6-wZ-n
βœͺ Monazite-(Ce)
Formula: Ce(PO4)
Habit: Tabular, Monoclinic, Masses to 2.4 kg
Colour: Brick-red, Brown, Tan
Fluorescence: None
Description: Exceptionally large, euhedral crystals with pronounced radioactivity. Polished section microprobe analysis indicates a high degree of homogeneity. Th content is 8-16 weight percent.
References:
F Roberts, 2006
βœͺ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Habit: Tetragonal, tapering foliated columnar, curved faces
Colour: Metallic silver with black mottling
Fluorescence: None
Description: Occurs as tapered columns of curved tetragonal flakes to 3cm length, 1-2cm girth. This variety is also known as "ball-peen" mica due to its resemblance to decorative hammered metal.
References:
F Roberts, 2006
β“˜ Opal
Formula: SiO2 · nH2O
β“˜ Opal var. Opal-AN
Formula: SiO2 · nH2O
β“˜ Quartz
Formula: SiO2
References:
F Roberts, 2006
β“˜ Quartz var. Milky Quartz
Formula: SiO2
Description: Forms the central dike of the pegmatite. Large crystal pockets occur in this dike that are lined with euhedral water-clear quartz crystals and possibly beryl.
β“˜ Quartz var. Smoky Quartz
Formula: SiO2
References:
F Roberts, 2006
β“˜ Rutile
Formula: TiO2
β“˜ Samarskite-(Y)
Formula: YFe3+Nb2O8
β“˜ Spessartine
Formula: Mn2+3Al2(SiO4)3
β“˜ Tanteuxenite-(Y)
Formula: Y(Ta,Nb,Ti)2(O,OH)6
Habit: metamict
Fluorescence: none
Description: Occurs in mixed-phase rare-earth mineral nodules from orange clay-filled pockets at quartz-microcline contacts.
β“˜ Thorianite
Formula: ThO2
β“˜ Thorite
Formula: Th(SiO4)
References:
F Roberts, 2006
β“˜ Uraninite
Formula: UO2
β“˜ Uranophane
Formula: Ca(UO2)2(SiO3OH)2 · 5H2O
β“˜ Uranopolycrase
Formula: (U4+,Y)(Ti,Nb)2O6
Habit: metamict
Fluorescence: none
Description: Occurs in mixed-phase rare-earth mineral nodules from orange clay-filled pockets at quartz-microcline contacts.
β“˜ 'Wad'
Habit: Earthy
Colour: brown, black, bluish-black
Fluorescence: none
Description: Normally found as thick weathered alteration coatings on euhedral spessartine garnets in the graphic granite zone of the pegmatite.
βœͺ Xenotime-(Yb)
Formula: Yb(PO4)
Habit: Massive, Tetragonal Bipyramidal
Colour: gray, black
Fluorescence: None
Description: Found as radioactive 1-3 cm nodules and 3-10 mm crystals at quartz-blocky microcline contacts and in orange clay-filled pockets near these zones.
β“˜ Zircon
Formula: Zr(SiO4)

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
β“˜Galena2.CD.10PbS
Group 3 - Halides
β“˜Fluorite3.AB.25CaF2
β“˜var. Chlorophane3.AB.25CaF2
Group 4 - Oxides and Hydroxides
β“˜'Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series'4..(Ta,Nb,Sn,Fe,Mn)4O8
β“˜'Microlite Group'4.00.A2-mTa2X6-wZ-n
β“˜Ilmenite4.CB.05Fe2+TiO3
β“˜Quartz
var. Milky Quartz		4.DA.05SiO2
β“˜4.DA.05SiO2
β“˜var. Smoky Quartz4.DA.05SiO2
β“˜Opal4.DA.10SiO2 Β· nH2O
β“˜var. Opal-AN4.DA.10SiO2 Β· nH2O
β“˜Rutile4.DB.05TiO2
β“˜Samarskite-(Y)4.DB.25YFe3+Nb2O8
β“˜Tanteuxenite-(Y)4.DG.05Y(Ta,Nb,Ti)2(O,OH)6
β“˜Euxenite-(Y)4.DG.05(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
β“˜Uranopolycrase4.DG.05(U4+,Y)(Ti,Nb)2O6
β“˜Uraninite4.DL.05UO2
β“˜Thorianite4.DL.05ThO2
Group 8 - Phosphates, Arsenates and Vanadates
β“˜Xenotime-(Yb)8.AD.35Yb(PO4)
β“˜Monazite-(Ce)8.AD.50Ce(PO4)
Group 9 - Silicates
β“˜Spessartine9.AD.25Mn2+3Al2(SiO4)3
β“˜Thorite9.AD.30Th(SiO4)
β“˜Zircon9.AD.30Zr(SiO4)
β“˜Uranophane9.AK.15Ca(UO2)2(SiO3OH)2 Β· 5H2O
β“˜Beryl
var. Aquamarine		9.CJ.05Be3Al2Si6O18
β“˜9.CJ.05Be3Al2(Si6O18)
β“˜Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜Microcline9.FA.30K(AlSi3O8)
β“˜Albite9.FA.35Na(AlSi3O8)
Unclassified
β“˜'Wad'-
β“˜'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2

List of minerals for each chemical element

HHydrogen
Hβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hβ“˜ Opal var. Opal-ANSiO2 · nH2O
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Hβ“˜ OpalSiO2 · nH2O
Hβ“˜ Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
Hβ“˜ UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
BeBeryllium
Beβ“˜ Beryl var. AquamarineBe3Al2Si6O18
Beβ“˜ BerylBe3Al2(Si6O18)
OOxygen
Oβ“˜ AlbiteNa(AlSi3O8)
Oβ“˜ Beryl var. AquamarineBe3Al2Si6O18
Oβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oβ“˜ BerylBe3Al2(Si6O18)
Oβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Oβ“˜ Opal var. Opal-ANSiO2 · nH2O
Oβ“˜ IlmeniteFe2+TiO3
Oβ“˜ MicroclineK(AlSi3O8)
Oβ“˜ Monazite-(Ce)Ce(PO4)
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ OpalSiO2 · nH2O
Oβ“˜ QuartzSiO2
Oβ“˜ RutileTiO2
Oβ“˜ Samarskite-(Y)YFe3+Nb2O8
Oβ“˜ Quartz var. Smoky QuartzSiO2
Oβ“˜ SpessartineMn32+Al2(SiO4)3
Oβ“˜ Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
Oβ“˜ ThorianiteThO2
Oβ“˜ ThoriteTh(SiO4)
Oβ“˜ UraniniteUO2
Oβ“˜ UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Oβ“˜ Uranopolycrase(U4+,Y)(Ti,Nb)2O6
Oβ“˜ ZirconZr(SiO4)
Oβ“˜ Quartz var. Milky QuartzSiO2
Oβ“˜ Xenotime-(Yb)Yb(PO4)
FFluorine
Fβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fβ“˜ Fluorite var. ChlorophaneCaF2
Fβ“˜ FluoriteCaF2
NaSodium
Naβ“˜ AlbiteNa(AlSi3O8)
MgMagnesium
Mgβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlAluminium
Alβ“˜ AlbiteNa(AlSi3O8)
Alβ“˜ Beryl var. AquamarineBe3Al2Si6O18
Alβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alβ“˜ BerylBe3Al2(Si6O18)
Alβ“˜ MicroclineK(AlSi3O8)
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Alβ“˜ SpessartineMn32+Al2(SiO4)3
SiSilicon
Siβ“˜ AlbiteNa(AlSi3O8)
Siβ“˜ Beryl var. AquamarineBe3Al2Si6O18
Siβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siβ“˜ BerylBe3Al2(Si6O18)
Siβ“˜ Opal var. Opal-ANSiO2 · nH2O
Siβ“˜ MicroclineK(AlSi3O8)
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ OpalSiO2 · nH2O
Siβ“˜ QuartzSiO2
Siβ“˜ Quartz var. Smoky QuartzSiO2
Siβ“˜ SpessartineMn32+Al2(SiO4)3
Siβ“˜ ThoriteTh(SiO4)
Siβ“˜ UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Siβ“˜ ZirconZr(SiO4)
Siβ“˜ Quartz var. Milky QuartzSiO2
PPhosphorus
Pβ“˜ Monazite-(Ce)Ce(PO4)
Pβ“˜ Xenotime-(Yb)Yb(PO4)
SSulfur
Sβ“˜ GalenaPbS
KPotassium
Kβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kβ“˜ MicroclineK(AlSi3O8)
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caβ“˜ Fluorite var. ChlorophaneCaF2
Caβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Caβ“˜ FluoriteCaF2
Caβ“˜ UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
TiTitanium
Tiβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Tiβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Tiβ“˜ IlmeniteFe2+TiO3
Tiβ“˜ RutileTiO2
Tiβ“˜ Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
Tiβ“˜ Uranopolycrase(U4+,Y)(Ti,Nb)2O6
MnManganese
Mnβ“˜ SpessartineMn32+Al2(SiO4)3
FeIron
Feβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feβ“˜ IlmeniteFe2+TiO3
Feβ“˜ Samarskite-(Y)YFe3+Nb2O8
YYttrium
Yβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Yβ“˜ Samarskite-(Y)YFe3+Nb2O8
Yβ“˜ Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
Yβ“˜ Uranopolycrase(U4+,Y)(Ti,Nb)2O6
ZrZirconium
Zrβ“˜ ZirconZr(SiO4)
NbNiobium
Nbβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Nbβ“˜ Samarskite-(Y)YFe3+Nb2O8
Nbβ“˜ Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
Nbβ“˜ Uranopolycrase(U4+,Y)(Ti,Nb)2O6
CeCerium
Ceβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Ceβ“˜ Monazite-(Ce)Ce(PO4)
YbYtterbium
Ybβ“˜ Xenotime-(Yb)Yb(PO4)
TaTantalum
Taβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Taβ“˜ Microlite GroupA2-mTa2X6-wZ-n
Taβ“˜ Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
PbLead
Pbβ“˜ GalenaPbS
ThThorium
Thβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Thβ“˜ ThorianiteThO2
Thβ“˜ ThoriteTh(SiO4)
UUranium
Uβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Uβ“˜ UraniniteUO2
Uβ“˜ UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Uβ“˜ Uranopolycrase(U4+,Y)(Ti,Nb)2O6

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Franklin Roberts postings.
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